Impossible Login: if dual screen is active, mouse is locked only in one monitor, the wrong one

[Benedetto]

Impossible Login ubuntu 20.04 :
if dual screen is active with an HDMI cable and set to extended desktop mode (that means that I have two screens displaying a part of the same big dekstop,and not duplicated)

mouse is locked only in one monitor, the wrong one.
This means that at login time, I get my Avatar with the password area in the second screen, and I get the purple ubuntu wallpaper and the mouse pointer on my Laptop screen instead.

Then when I try to move the mouse from the Laptop screen to the second external screen mouse is stucked at the border and doesnt jump to the other screen so I can't click on the second screen and login.

The only way to login is to disconnect the second monitor so the login aerea comes back in my laptop screen, then login in and then connect the monitor again.

Also keep in mind that I set my laptop screen as the main one, and the external as secondary so at login time it's wrong that i get the main login aerea in the secondary screen instead. That is a bug too, but the main is concern is that I can't even move the mouse there to login.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1919429/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1760849, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.